3O6F

Crystal structure of a human autoimmune TCR MS2-3C8 bound to MHC class II self-ligand MBP/HLA-DR4

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Structure of a TCR with high affinity for self-antigen reveals basis for escape from negative selection.

Yin, Y., Li, Y., Kerzic, M.C., Martin, R., Mariuzza, R.A.

(2011) EMBO J 30: 1137-1148

  • DOI: 10.1038/emboj.2011.21
  • Primary Citation of Related Structures:  
    3O6F

  • PubMed Abstract: 

    • The failure to eliminate self-reactive T cells during negative selection is a prerequisite for autoimmunity. To escape deletion, autoreactive T-cell receptors (TCRs) may form unstable complexes with self-peptide-MHC by adopting suboptimal binding topologies compared with anti-microbial TCRs ...

    The failure to eliminate self-reactive T cells during negative selection is a prerequisite for autoimmunity. To escape deletion, autoreactive T-cell receptors (TCRs) may form unstable complexes with self-peptide-MHC by adopting suboptimal binding topologies compared with anti-microbial TCRs. Alternatively, escape can occur by weak binding between self-peptides and MHC. We determined the structure of a human autoimmune TCR (MS2-3C8) bound to a self-peptide from myelin basic protein (MBP) and the multiple sclerosis-associated MHC molecule HLA-DR4. MBP is loosely accommodated in the HLA-DR4-binding groove, accounting for its low affinity. Conversely, MS2-3C8 binds MBP-DR4 as tightly as the most avid anti-microbial TCRs. MS2-3C8 engages self-antigen via a docking mode that resembles the optimal topology of anti-foreign TCRs, but is distinct from that of other autoreactive TCRs. Combined with a unique CDR3β conformation, this docking mode compensates for the weak binding of MBP to HLA-DR4 by maximizing interactions between MS2-3C8 and MBP. Thus, the MS2-3C8-MBP-DR4 complex reveals the basis for an alternative strategy whereby autoreactive T cells escape negative selection, yet retain the ability to initiate autoimmunity.

    Organizational Affiliation: 

    Institute for Bioscience and Biotechnology Research, University of Maryland, WM Keck Laboratory for Structural Biology, Rockville, MD, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chainA, E182Homo sapiensMutation(s): 0 
Gene Names: HLA-DRA, HLA-DRA1
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PHAROS:  P01903
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UniProt GroupP01903
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DRB1-4 beta chainB, F221Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell receptor alpha chain C regionC, G206Homo sapiensMutation(s): 0 
Gene Names: TRAC, TCRA
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PHAROS:  P01848
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UniProt GroupP01848
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
T-cell receptor beta-1 chain C regionD, H245Homo sapiensMutation(s): 1 
Gene Names: TRBC1
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PHAROS:  A0A5B9
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UniProt GroupA0A5B9
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.48α = 90
b = 218.403β = 90
c = 98.412γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-09-07
    Changes: Database references
  • Version 1.3: 2017-08-09
    Changes: Advisory, Refinement description, Source and taxonomy